Improvement in flour-mills



W. B.y ALLEN.

Flour Mills.A

No. 133,819. I l Patented Dec.10,1872-.

AM. PH-LITHUGRAPHC CD-NJ {USBOHNE'S PROCESS.)

UNITED STATEs- PATENT OFFICE.

wILLiAM E. ALLEN, or wINoNA, MINNEsoTA,-AssIeNoE or ONE-HALE 'His EIGHT To EEAsTUs N. WEST, or sAME PLAGE.

IMPROVEMENT IN FLQUR-MILLS.

Specification forming part of Letters Patent No. 133,819, dated Dcember 1-0, 1872. l

' it' said ston'es were provided with rigid lugs projecting from their periphery.- My invention further relates to a mode of rendering the non-revolving millstones adj ustable; and consists of a spring-bar pressing at each end upon the niillstone and acted upon by a bar or lever adjusted by means of a screw and nut; the obj ect being to grind finer and coarser, as the case may be.

In the drawing, Figure l represents a top view oi' luy-improved grinding-mill; and Fig. 2 is a side view of one of the non-revolving stones, showing the spring-bar and `tramwheels.

A represents a rectangular or other frame supporting the shaftwhich may consist of sections B B joined together at their ends by couplings e e. C represents the driving-pulley,

' iirmly secured to the shaft B, which gives motion to the shaft and millstones.

D D are millstones iirmly secured to the. shaft B to revolve with the same. Upon one or both sides of the stones D is arranged loosely one ormore non-revolving stones, E E, having upon their opposite peripheries tram-wheels t a,

, which rest upon the upper surface of the frame A, thus enabling the said stones to be run back from contact with the stone D, when it, is so desired for any purpose. Arranged upon the shaft B, and each-end bearing on an elastic block, b, on the non-revolving stones E, is a spin g-bar,`(l, which exerts a pressure on the said stones and `presses them at all times toward the revolving stone D; and acting upon pivoted to one side ot the frame A and extends to the opposite side, where it is rendered adjustable by means of the bolt h passing through an opening in its end, and provided with a nut, g, the other end of this/bolt h be-l ing held in a small standard or block, f, attached to the frame A.

By this arrangement the nonrevolving stones E have a tendency at all times to press toward the revolving stone D; but, at the same time, should any hard substance get between the grinding-surfaces the said matter will overcome the resistance of the spring-bar c, pressing the same outward andrpermitting the hard substance to pass through without 'injuring the grinding surface of the stones,

which willafterward assume their original position, thus rendering the said stones selfadjusting.

By means of the sections of shafting and theircouplings any number of millstones may be used,saving great expense and labor, inasmuch as only three stones are necessary to l do the work of six in the ordinary manner.

I do not claim stops upon the periphery ot `millstones to support and prevent the same from revolving, for suoli are old and well known.

Having thus described my invention, l claim- 1. The tram-wheels ai, in combination with one or more adjustable non-revolving millstones, substantially as and for the purpose described.

2. The spring-bar c, elastic Lblocks b, lever d,

screw and nut g h, and one or morenon-revolving millstones, in combination with one or more revolving millstones, the drivingshaft, and its gear mechanism, substantially as and for the purpose specilied.

,In testimony that I claim the `foregoing l have hereunto set my hand this 24th day of September, 1872.

WILLIAM B. ALLEN.

' Witnesses:

NORMAN BUCK, NV. S. M. ABBOTT.

this bar C at its center is a lever, d, which is 

